desaparecieran
Imperfect subjunctive ellos/ellas/ustedes conjugation of desaparecer.

desaparecer

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Inicialmente, se esperaba que palidecieran y se desaparecieran en unos pocos días, pero persistieron durante meses - incluso un año en algunas longitudes de onda.
Initially, they were expected to fade and disappear in a few days, but they persisted for months afterwards - even a year in some wavelengths.
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